Method checkRange

lib/java/util/TreeMap.java:394–413

(K key)

        }

        private void checkRange(K key) {
            Comparator<? super K> cmp = backingMap.comparator;
            if (cmp == null) {
                Comparable<K> object = toComparable(key);
                if (hasStart && object.compareTo(startKey) < 0) {
                    throw new IllegalArgumentException();
                }
                if (hasEnd && object.compareTo(endKey) > 0) {
                    throw new IllegalArgumentException();
                }
            } else {
                if (hasStart
                    && backingMap.comparator().compare(key, startKey) < 0) {
                    throw new IllegalArgumentException();
                }
                if (hasEnd && backingMap.comparator().compare(key, endKey) > 0) {
                    throw new IllegalArgumentException();
                }
            }
        }

        private boolean isInRange(K key) {
            Comparator<? super K> cmp = backingMap.comparator;